DMS-20 ETC1

Document overview

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Technical content

Features

Figure 1. DMS-20LCD Series Simplified Schematic available in any other meters. and non-backlit versions are available. and ±200V) and a user-friendly input structure. Input impedance is a minimum 800kΩ . protected to ±100V (±250V for the ±200V input model). annunciator and feature autopolarity changeover and overrange indication. 4-20mA inputs, zero/gain adjust, decimal point location, and input voltage dividing.

  • •••• Large (0.37"/9.4mm), enhanced- contrast LCD display
  • •••• Backlit displays optional
  • •••• Epoxy-encapsulated, 12-pin DIP
  • •••• Panel or pc-board mountable
  • •••• 4 differential input voltage ranges
  • •••• High accuracy, ±1 count (±0.05%)
  • •••• Single +5V supply or 9V battery
  • •••• Low-battery annunciator
  • •••• User-selectable decimal point placement
  • •••• 0 to +60°C temperature range 3½ Digit, LCD Display Low-Cost, Subminiature Digital Panel Voltmeters DMS-20LCD Series Actual Size (+) INPUT HI (–) INPUT LO ANALOG COMMON REFERENCE OUT REFERENCE IN +5V SUPPLY/ +BATTERY DP 1 DP 2 DP 3 4 9 DC/DC CONVERTER 5V RETURN/ –BATTERY +5V –5V /GBB+2.0V DATA 909k A/D CONVERTER0 Vdc 0.01µF N.C. R2 is not used on ±200mV (-0) models or ±2V (-1) models. R2 = 100k on ±20V (-2) models and 9.1k on ±200V (-3) models. DC/DC converter is not used on 9V-powered models, J1 is connected. N.C./BACKLIGHT Used on backlit models only. N.C. for non-backlit models. +5V Only used on ±200mV (-0) and ±2V (-1) models. www.datel.com

DMS-20LCD 3½ DIGIT, LCD DISPLAY DIGITAL PANEL VOLTMETERS Performance/Functional Specifications Typical at TA = +25°C and supply voltage = +5V (using the single-ended input circuit) or +9V (using the differential input circuit), unless otherwise noted. ➀ Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11) with (–) INPUT LO (pin 12) properly connected. Pin 12 is not overvoltage protected (see Figure 1). Voltages applied to pin 12 should not exceed the supply voltage. ➁ Listed spec applies to 5V-powered models only. For 9V-powered models, both (–) INPUT LO (pin 12) and (+) INPUT HIGH (pin 11) must always be at least 1.5V above –BATTERY (pin 3) and at least 1.5V below +BATTERY (pin 1). ➂ See Technical Notes. Leave blank for standard models. Add B for backlit models. DMS-20LCD - 1 - 5 Accessories: DMS-20-CP Panel cutout punch DMS-BZL3 DMS-20 bezel assembly DMS-BZL4 DMS-20 bezel assembly with sealing gasket MOLEX connector, decimal point solder pads and attenuation resistor pads. DMS-PS1-CM +5V/1.0A AC/DC power supply module Input Range: 0 = ±200mV 1 = ±2V 2 = ±20V 3 = ±200V Power Source: 5 = +5V 9 = +9V Technical Notes 1. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a precision reference actively trimmed at the factory. In normal operation, pin 8 must be tied to pin 7 to achieve all listed accuracy and drift specifications. 2. ANALOG COMMON (Pin 10): This pin is connected to an internal, low-noise, "relative" ground. It is used in certain differential and "floating" measurements as described in the Applications section of this data sheet and Ap Note 3 of the DATEL Panel Meter Catalog. Pin 10 should not be connected to pin 3 (5V RETURN/–BATTERY) or to your system's analog ground. 3. Decimal Point Placement: The location of the decimal point is user-selectable, and the decimal point control pins (DP1-DP3) are active low functions. Select the appropriate decimal point by tying the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN/ –BATTERY). Unused decimal point location pins should be left open. For 5V-powered models, the decimal location pins are TTL compatible and may be hard wired as described above or driven with 5V TTL logic gates.

Ordering Information

A panel-mount retaining clip is supplied with each model. Analog Inputs Min. Typ. Max. Units Full Scale Input Range: DMS-20LCD-0 -- ±200 -- mV DMS-20LCD-1 -- ±2 -- Volts DMS-20LCD-2 -- ±20 -- Volts DMS-20LCD-3 -- ±200 -- Volts Input Impedance: DMS-20LCD-0, -1 100 1000 -- M Ω DMS-20LCD-2, -3 0.8 1 -- M Ω Overvoltage Protection: ➀ DMS-20LCD-0, -1, -2 -- -- ±100 Volts DMS-20LCD-3 -- -- ±250 Volts Common Mode Voltage Range ➁ -- -- ±2 Volts CMRR (dc to 60Hz) -- 86 -- dB Control Inputs ➂ Decimal Point Placement (Pins 4-6): Functionality Tie to pin 3 to activate Logic Compatibility TTL (on 5V-powered models) Backlight (Pin 9) Tie to pin 3 to turn on backlight Performance Sampling Rate 2.5 samples per second Accuracy (1 minute warm-up): DMS-20LCD-0 (VIN = +0.19V) -- ±1 ±2 Counts DMS-20LCD-1 (VIN = +1.9V) - - ±1 ±2 Counts DMS-20LCD-2 (VIN = +19V) -- ±2 ±3 Counts DMS-20LCD-3 (VIN = +190V) -- ±2 ±3 Counts Zero Reading (VIN = 0 Volts) "–001" "000" "001" Temperature Drift (0 to +60°C) -- ±0.2 ±0.4 Cnts/°C Power Supply Requirements (5V Models) Supply Voltage +4.75 +5.00 +5.25 Volts Supply Current: Standard Models -- +400 +600 µA Backlit Models -- +35 +50 mA Power Supply Requirements (9V Models) Supply Voltage +7.5 +9.0 +14.0 Volts Supply Current: Standard Models -- +230 +350 µA Backlit Models -- +35 +50 mA Display Display Type and Size 3½ Digit LCD, 0.37"/9.4mm high Polarity Indication Autopolarity ("–" for negative VIN) Overrange Indication "–1_ _ _" for negative VIN "1_ _ _" for positive VIN Physical/Environmental Operating Temperature 0 -- +60 °C Storage Temperature –20 -- +75 °C Humidity (Non-condensing) 0 -- 95 % Case Material Polycarbonate Weight 0.4 ounces (11 grams) Order on-line at www.datel.com

3½ DIGIT, LCD DISPLAY DIGITAL PANEL VOLTMETERS DMS-20LCD DMS-20LCD meters are available in either 5V-powered or 9V- powered models. 9V devices operate directly from 7.5V to 14V supplies (usually batteries) without the need for external voltage regulators. 9V devices, however, can not be used to measure voltages referenced to the negative battery terminal (pin 3) because the minus input to the meter (pin 12, (–) INPUT LO) must always be at least 1.5V above pin 3. 9V-powered meters can only be used to make differential and not single-ended measurements. 5V-powered devices operate from any well-regulated +5V supply and will accurately measure voltages both above and below pin 3 (5V RETURN) in either single-ended or differential configurations. 1. Single-Ended Input Configurations: True single-ended measurements can only be made with 5V-powered meters. The circuit of Figure 2 avoids problems normally associated with ground-loop currents. Separate ground runs should be used for 5V RETURN (pin 3) and (–) INPUT LO (pin 12). 8. Suggested Mating Connectors: Panel mounted: Connector housing DATEL P/N 39-2079400 Terminal type DATEL P/N 39-2099090 Crimping tool DATEL P/N 39-2099000 Wire size 22 to 26 AWG Insulation diameter 0.062" (1.57mm) maximum Stripping length 0.100 to 0.125" (2.54 to 3.17mm) Board mounted: Socket DATEL P/N 39-2359625

Applications

Figure 2. Single-Ended Input Configuration

  1. Low Battery Annunciator: The "B" annunciator in the upper

approximately 7.2V. This function can not be disabled.

  1. Gain Adjust: There is a gain-adjust potentiometer on the back

provides ±10% range of adjustment.

  1. Soldering Methods: All models in the DMS-20LCD Series
  2. BACKLIGHT (Pin 9) Function: Grounding pin 9 (i.e. connecting

will be reduced proportionately.

3½ DIGIT, LCD DISPLAY DIGITAL PANEL VOLTMETERS DMS-20LCD To calibrate the circuit of Figure 7, perform the following: 1. With 4mA applied, adjust the 50k Ω potentiometer (R2) to display a reading of "000" (assuming that is the desired reading). 2. With 20mA applied, adjust the gain-adjust potentiometer on the back of the meter to display a reading of "1999". For different full scale readings, alter the value of R Shunt accordingly. RShunt = R1 = VFsr /I Fsr Where: V Fsr = Full scale reading (in Volts) IFsr = Relative full scale current (in Amps) Example: For a meter with a 2V full scale input (1.999 full scale reading) and a desired full scale display reading of 1000 (with an input of 20mA), VFsr = 1.000 Volts RShunt = 1.000V/(0.020 – 0.004)A RShunt = 1.000V/0.016A = 62.5 Ohms function of the scaling requirements of the particular application and can be calculated using the following equation: Figure 7. 4-to-20mA Current Loop Operation

  1. Power Supply Monitoring: A popular application for DATEL's

(pin 5 tied to pin 3), the meter reads 9.00 Volts.

  1. External Gain Adjustment: Connect REFERENCE OUT

a precise, near-full-scale, input voltage. Figure 9. External Gain Adjustment Figure 8. Power Supply Monitor /G31 /G33 /G2B /G35 /G56 /G20 /G53 /G55 /G50 /G35 /G56 /G20 /G52 /G45 /G54 /G41 /G43 /G20 /G74 /G6F /G20 /G44 /G43 /G20 /G43 /G6F /G6E /G76 /G65 /G72 /G74 /G65 /G72 /G31 /G32 /G28 /G96 /G29 /G20 /G49 /G4E /G20 /G4C /G4F /G31 /G30 /G41 /G4E /G41 /G20 /G43 /G4F /G4D /G4D /G31 /G31 /G28 /G2B /G29 /G20 /G49 /G4E /G20 /G48 /G49 /G52 /G31 /G2B /G96 /G34 /G2D /G32 /G30 /G6D /G41 /G35 /G30 /G6B /G52 /G32 /G38 /G37 /G52 /G45 /G46 /G20 /G4F /G55 /G54 /G52 /G45 /G46 /G20 /G49 /G4E /G44 /G4D /G53 /G2D /G32 /G30 /G4C /G43 /G44 /G2D /G31 /G2D /G35 /G44 /G41 /G54 /G45 /G4C /G44 /G4D /G53 /G2D /G50 /G53 /G31 /G2D /G43 /G4D /G38 /G35 /G2D /G32 /G36 /G34 /G56 /G61 /G63 +BAT (–) IN LO –BAT (+) IN HI DP2 DMS-20LCD-1-9 45.3k 10.1k 45.3k BATTERY REF OUT REF IN

12 VOLTAGE

(+) IN HI (–) IN LO ANA COMM = 10 to 20 Turns REF IN 732, 1% 8.06k, 1% 5V RET/ –BAT IN Connections for ±2V, ±20V and ±200V models Connections for ±200mV models COM +5V IN/ +BAT IN 17.4k, 1%2k 24.3k, 1% DMS-20LCD For +5V models, tie (–) IN LO to pin 3. For +9V models, tie (–) IN LO to pin 10 NC 200 /G81 /G81 /G81

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com Email: sales@datel.com Data sheet fax back: (508) 261-2857 DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH München, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025 DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark. ISO 9001ISO 9001 REGISTERED DS-0291C 01/02 DMS-20LCD 3½ DIGIT, LCD DISPLAY DIGITAL PANEL VOLTMETERS Mechanical Specifications MECHANICAL DIMENSIONS: Inches (mm) TOLERANCES: 2 PL DEC ±0.02 (±0.51) 3 PL DEC ±0.010 (±0.254) LEAD DIMENSIONS: 0.025 (0.635) x 0.025 (0.635) NOMINAL RECOMMENDED PC BOARD FINISHED HOLE DIAMETER: MADE IN USA DMS-20LCD-X-XX FRONT VIEW DP1 DP2 DP3 PIN #1 IDENTIFIER +5V SUPPLY/ +BATTERY N.C. 5V RETURN/ –BATTERY DP3 DP2 DP1 (–) INPUT LO (+) INPUT HI ANALOG COMMON N.C./BACKLIGHT REFERENCE OUT REFERENCE IN 0.80 (20.3) 0.15 (3.8) TYP. 0.50 (12.7) 0.10 (2.5) TYP. 0.040 (1.02) 0.040 (1.02) 1.10 (27.9) 0.10 (2.5) TYP. 0.25 (6.4) TYP. 0.425 (10.80) 0.040 (1.02) 1.30 (33.0) 1.38 (35.1) 0.88 (22.3) ® ® 0.160 (4.06) 0.160 (4.06) PIN 1 CALIBRATION POTENTIOMETER HOLE LOCATION 0.125 (3.175) DIAMETER (USE ONLY WHEN PC BOARD MOUNTING) /C174 /C174 /C66/C69/C90/C69/C76/C32/C73/C78/C83/C84/C65/C76/C76/C65/C84/C73/C79/C78 /C66/C69/C90/C69/C76 /C80/C65/C78/C69/C76 #2-56 INSERT 0.156 (3.96) DEEP FRONT VIEW 1.280 (32.51) 0.187 (4.75) OPTIONAL BEZEL (DMS-BZL3 and DMS-BZL4) RECOMMENDED DRILL AND PANEL CUTOUT DIMENSIONS 1.826 (46.38) 0.838 (21.29) 1.336 (33.93) 1.626 (41.30) 1.07 (27.18) INTERNAL CORNER RADII: 0.032 (0.81) MAX. 0.145 (3.68) 0.093 (2.362) DIAMETER (4 REQUIRED) ONLY WHEN USING OPTIONAL BEZEL ASSEMBLY 0.116 (2.95) /C174 /C174 /C82/C69/C84/C65/C73/C78/C73/C78/C71/C32/C67/C76/C73/C80/C32/C73/C78/C83/C84/C65/C76/C76/C65/C84/C73/C79/C78 /C80/C65/C78/C69/C76